I use Photoshop Touch.
I have problem.
How can I rotate cavas with 90 degrees?
I guess you would like to have your width as height after the rotation.
To accomplish that try the following steps:
1. open &-menu and choose Crop
2. within the Crop mode you need to change the height to the same value as you have for your width.
3. now you can rotate your document via the Cross Menu
4. Crop again to match the width
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